Gurus,
I posted a couple of weeks ago about a noise that I thought was the turbo going bad. It turned out to be my hydraulic fan running at max speed. Richard's description in a previous post on this thread is spot on. I suggest you follow Russ's lead and add a spare solenoid and valve to your spare inventory. The parts are small and not terribly expensive and are a little hard to find so it makes sense to find a set to keep with the coach.
I ended up replacing the valve as well as the solenoid.
A source for the valve is
Motion Industries. I obtained the solenoid via eBay
(Use the part number in the previous post) however Newell had some available at a lower price. Your mileage may vary..
The replacement process was to use a pan under the valve to catch the ATF oil. Use ring grease on both valve O-rings then simply unscrew the old valve and replace with the new one as quickly as you can. The solenoid then bolts right on.
[Be careful not to over torque when you attach the solenoid] (there is only one way that the solenoid goes). Hook the new solenoid to the old wires. NOTE: Test by running the engine. If the fan barely turns or turns slowly, you are in business. As previously stated, if the solenoid fails, the fan will default to high speed.
In my case the failure of the valve & solenoid caused a dead short which drew enough current to get the wires going to the solenoid nice and melty. See pictures.
The resulting current draw caused a series of other problems that I will document in another post.
)
